Will Smith hosts the six part “Welcome to Earth” (Disney+, streaming) a new series from National Geographic that concentrates on different parts of the planets.

The German comedian Carolin Kebekus titles her latest stand-up special “The Last Christmas Special”  (Netflix, streaming).

“CMT’s A Tennessee Kind of Christmas” (CMT, 9 p.m.) features Amy Grant, Billly Ray Cyrus, Clay Water, Pam Tillis, 

Dean Cain and Laura McKenzie look at holiday traditions across the globe on the special “Christmas Around the World” (CW, 8 p.m.).

“The Drowning” (Sundance TV, midnight) is a four-part British drama about a mom who is convinced a strange teen is her son who drowned nine years before. Jill Halfpenny stars.

Wynonna, Billy Ray Cyrus, Amy Grant, Clay Walker, Pam Tillis, Tracy Lawrence, Sara Evens and Steve Wariner all be included in the special “A Tennessee Kind of Christmas” (CMT, 9 p.m.).  

Brett Young joins forces with Boyz II Men, Cobie Caillat, Darius Rucker and Gavin DeGraw, among others, for a Christmas themed “CMT Crossroads” (CMT, 8 p.m.). 

“CSI: Vegas” (CBS, 10 p.m.) has its season finale with an episode in which David Hodges (Wallace Langham) goes missing. 

“Dirty Tricks” (Showtime, 8 p.m.) is Daniel Sivan’s documentary about a scandal that rocked the world of professional bridge.